Change Marionette to DalekJS

As stated in the footer at least some of the text was "borrowed" from backbone.marionette. It seems like as part of that re-use of text "Marionette" was left in by mistake. Changed instances of "Marionette" to "DalekJS".
Merge pull request #89 from Altiss/patch-1

fix(docs): Change Marionette to DalekJS